Preheat oven to 400°F. Pierce potatoes with fork; bake directly on rack 50-60 minutes until very tender.
Cool 10 minutes; halve lengthwise. Scoop out most flesh, leaving about 1/4 inch attached to skin.
Mix scooped flesh with chicken, 3/4 cup BBQ sauce, and half the cheddar; season with salt and pepper.
Brush skins with melted butter; place on baking sheet and fill generously with chicken mixture.
Top with remaining cheddar; bake 12-15 minutes until melted, broiling last 2-3 minutes for golden, bubbly cheese.
Drizzle with remaining BBQ sauce; top with bacon, sour cream, cilantro, and green onions. Serve.